Answer to Question 1
Any three of the following:
soluble in water (sugars, some starches, most salts)
soluble in acid (limestone and most mineral deposits)
soluble in alkali (protein, fat emulsions)
soluble in water, alkali, or acid
Answer to Question 2
Carbohydrates and proteins can be reclaimed and used as animal feed.
Remaining wastes in an animal-processing facility can be sold to a rendering plant.